JP7257661B2 - Anchor pile and its construction method - Google Patents

Description

The present invention relates to an anchor pile that is constructed on the ground or the like for the purpose of indicating a land boundary or fixing a structure to the ground, etc., and a construction method for this anchor pile.

In order to protect the rights of land owners, stakes are driven into the reference points of the land boundaries to clarify the boundaries of the land. This type of stake is required to be firmly fixed to the ground or the like so that it does not come off easily. In addition, in order to prevent above-ground structures such as fences, pillars, and pedestals from collapsing or moving, these above-ground structures have conventionally been fixed to anchor piles driven into the ground. . As this type of anchor pile, a steel pipe is generally used, and in order to increase the pull-out resistance, there has been proposed a pipe having projections or the like on its outer surface.

For example, in Patent Document 1, as shown in FIG. 1 and the like of the same document, a pile anchor 10 in which pull-out resistance is increased by providing a spiral vane plate 21 (spiral projection) on the outer peripheral surface of a steel pipe. (anchor piles) have been proposed. This anchor pile can increase the pull-out resistance by increasing the amount of protrusion of the spiral wing plate 21, but on the other hand, the pushing resistance and rotation resistance when driving (screwing) the anchor pile into the ground are increased. It had the drawback of being large and making it difficult to drive (hardly screw) the anchor pile into the ground.

In view of such a situation, in Patent Document 2, as shown in FIG. 7 of the same document, the protrusion 9 is driven into the ground with the protrusion 9 accommodated inside, and then the protrusion 9 is placed in the ground. is proposed. In the anchor pile 1 of Patent Document 2, when the resistance member 6 is pulled upward in the vertical direction of the pipe 2 using the auxiliary tool 10, the protrusion 9 of the resistance member 6 is guided by the guide portion 5 and protrudes from the insertion hole portion 3. It has a structure that Patent Document 2 states that by adopting the above configuration, the anchor pile 1 can be easily constructed and has a large pull-out resistance (see paragraph 0042 of the same document). is described.

JP-A-10-183617 JP 2016-217093 A

However, in the anchor pile 1 of Patent Document 2, the resistance member 6 is made of metal (paragraph 0053 of the same document). It is necessary to form a thin plate that is elastically deformable, including the protruding portion 9 . For this reason, in the anchor pile 1 of Patent Document 2, even if the resistance member 6 is pulled up with the auxiliary tool 10 when the soil at the place where the anchor pile 1 is driven is hard, the projecting portion 9 does not move outward from the insertion hole portion 3. The protrusion 9 protruding from the insertion hole 3 without protruding is in a state along the outer peripheral surface of the pipe 2, or the protrusion 9 does not protrude from the insertion hole 3 and is bent to provide a desired pull-out resistance. There was a fear that it would not work.

The present invention was made to solve the above problems, and while it is easy to construct, it has a large resistance to pulling out from the ground, and regardless of the state of the soil at the location where it is constructed, To provide an anchor pile capable of exhibiting desired pull-out resistance. Another object of the present invention is to provide an anchor pile construction method for burying this anchor pile in the ground.

The above issues are
a pile body whose lower side is buried in the ground;
a movable projecting body capable of projecting outward from the pile body through a projecting body opening provided on the lower outer surface of the pile body;
and an operation shaft inserted into the pile body from the operation shaft insertion opening provided on the top of the pile body,
The base end side of the movable projecting body is pivotally supported by the pile body, a plurality of teeth α are formed in a gear shape on the outer peripheral surface of the base end side of the movable projecting body, and a plurality of teeth are formed on the outer peripheral surface of the operating shaft body. Part β is formed,
When the operating shaft is inserted into the pile main body through the operating shaft insertion opening and lowered, the teeth α and β engage to convert the downward movement of the operating shaft into the rotational movement of the movable protrusion. , the movable projecting body rotates upright and protrudes outward from the opening for the projecting body ,
The problem is solved by providing an anchor pile characterized in that when the operating shaft is lifted, the movable protruding body is tilted and rotated to be stored inside the pile body.

In this way, by adopting a structure in which the toothed portion α provided on the movable projecting body engages with the toothed portion β provided on the operating shaft and the movable projecting body rotates upright , even when the soil around the anchor pile is hard, etc., it is possible to reliably project the movable projecting body outward from the pile body. This is because the teeth (the teeth α and the teeth β) provided on the separate members (the movable projecting body and the operating shaft) mesh with each other so that the linear motion of one member (the operating shaft) moves the other member (the movable The mechanism that converts the rotational motion of the protruding body) is generally called a "rack and pinion mechanism". By adjusting the radius of rotation of the teeth (teeth α) of the rotating member (movable protrusion), it is possible to generate a large torque in the rotating member (movable protrusion). is. In addition, in the configuration of the present invention, it is not necessary to elastically deform the movable projecting body, and therefore it is possible to form the movable projecting body with a member having a thickness and high rigidity (for example, a block-shaped member).

In the anchor pile of the present invention, it is also preferable that at least one of the tooth portion α and the tooth portion β is formed into a thread shape (formed by a helical convex portion). As a result, the tooth portion β can more reliably feed the tooth portion α in a state where the tooth portion α and the tooth portion β are not disengaged from each other, and the movable protruding body can be more reliably rotated upright. becomes possible.

In the anchor pile of the present invention, a pair of projecting body openings are provided on the opposite side of the outer surface of the pile body, and a pair of movable projecting bodies project in opposite directions from the pair of projecting body openings. It is also preferable to In this way, by projecting the pair of movable protrusions from the pile body to the opposite side, it is possible not only to increase the pull-out resistance of the anchor pile, but also to stabilize the anchor pile in a well-balanced manner in the ground.

In the anchor pile of the present invention, the projecting body openings are provided in a plurality of stages at different heights on the outer surface of the pile body, and the movable projecting body projecting from the projecting body opening of one stage and the one stage It is also preferable that the movable protrusions that protrude from the protrusion openings in a stage different from the protrusion openings in the second step are projected in non-parallel directions. In this way, by protruding the movable protrusions in different directions from different heights in the pile body, it is possible to further increase the pull-out resistance of the anchor pile.

In the anchor pile of the present invention, a jig screwing portion for screwing a jig when pulling out the pile main body from the ground is formed on the inner peripheral surface near the upper end of the operation shaft insertion opening. is also preferred. In the anchor pile of the present invention, when the operation shaft is raised, the movable protruding body rotates (falls down) in the direction opposite to when the operation shaft descends, and is stored inside the pile body, thereby resisting pull-out. By adopting the above configuration, the jig can be screwed into the jig screw portion of the operation shaft insertion opening after the operation shaft has been pulled out. It becomes possible to firmly attach the jig (extraction jig) used when pulling out the anchor pile (pile body) from the ground to the pile body. Therefore, it is possible to easily pull out the pile body with the movable projecting body inside from the ground.

As described above, according to the present invention, although construction is easy, the pull-out resistance from the ground is large, and the desired pull-out resistance can be exhibited regardless of the condition of the soil at the location where it is constructed. It becomes possible to provide anchor piles that can be It is also possible to provide an anchor pile construction method for burying this anchor pile in the ground.

It is the perspective view which showed the whole anchor pile of 1st embodiment. It is the perspective view which showed the operation shaft in the anchor pile of 1st embodiment. FIG. 4 is a perspective view showing a movable protrusion in the anchor pile of the first embodiment; Fig. 4 is a cross-sectional perspective view showing a state in which the anchor pile of the first embodiment is cut along a plane including its center line, showing a state before the operation shaft is inserted into the operation shaft insertion opening of the pile body. It is a diagram. Fig. 4 is a cross-sectional perspective view showing a state in which the anchor pile of the first embodiment is cut along a plane including its center line, in which the operation shaft is inserted into the operation shaft insertion opening of the pile body, and the movable projecting body stands up; FIG. 10 is a diagram showing a state immediately before starting rotation (a state in which the movable projecting body is in the retracted position); Fig. 2 is a cross-sectional perspective view showing a state in which the anchor pile of the first embodiment is cut along a plane including its center line, in which the movable projecting body rotates to stand up and protrudes outward from the pile body (movable projecting Fig. 10 shows a state in which the body is in a protruding position). It is the perspective view which showed the whole anchor pile of 2nd embodiment. It is the perspective view which showed the operation shaft in the anchor pile of 2nd embodiment. Fig. 10 is a perspective view showing a movable protrusion in the anchor pile of the third embodiment; It is the figure which showed the state which looked at the movable protrusion in the anchor pile of 3rd embodiment from the side. FIG. 10 is a top view of a pair of movable projections in the anchor pile of the third embodiment, showing a state in which the movable projections are in a projecting position;

A preferred embodiment of the anchor pile and its construction method of the present invention will be described more specifically with reference to the drawings. Below, three embodiments (first embodiment, second embodiment, and third embodiment) are mentioned as an example, and the anchor pile etc. of this invention are demonstrated. However, the technical scope of the anchor pile of the present invention is not limited to these embodiments, and can be appropriately modified within the scope of the invention.

1. Anchor pile of the first embodiment First, the anchor pile of the first embodiment will be described. FIG. 1 is a perspective view showing the entire anchor pile 10 of the first embodiment. FIG. 2 is a perspective view showing the operating shaft 13 in the anchor pile 10 of the first embodiment. FIG. 3 is a perspective view showing the movable protrusion 12 of the anchor stake 10 of the first embodiment. 4 to 6 are cross-sectional perspective views showing a state in which the anchor pile 10 of the first embodiment is cut along a plane including its center line. 4 shows the state before the operation shaft 13 is inserted into the operation shaft insertion opening 11b of the pile main body 11, and FIG. Fig. 6 shows the state immediately before the movable projecting body 12 starts to stand up and rotate (the state in which the movable projecting body 12 is in the retracted position) after the movable projecting body 12 has started up and rotated. 2 shows a state in which the movable projecting body 12 is projected outward from (a state in which the movable projecting body 12 is at the projecting position).

The anchor pile 10 of the first embodiment is composed of a pile body 11, a movable protrusion 12, and an operating shaft 13, as shown in FIG.

1.1 Pile Main Body The pile main body 11 is a member whose lower side is buried in the ground. The upper part of the pile body 11 (the part exposed above the ground after the lower side of the pile body 11 is buried in the ground) is connected to ground structures such as fences, pillars, and pedestals, and these ground structures. A structure fixing portion (not shown in FIG. 1 and the like) for connecting supports such as wires and support frames for supporting the ground structure is provided. The structure fixing part is usually provided as a hook part, a ring part, a bolt screwing part, or the like.

As shown in FIG. 4, inside the pile main body 11, an operation shaft guide portion 11a is provided in a hole shape for guiding an operation shaft 13, which will be described later, in the vertical direction. The upper side of the operation shaft guide portion 11a is connected to the operation shaft insertion opening 11b provided in the upper end surface of the pile body 11, and the operation shaft guide portion 11a is inserted through the operation shaft insertion opening 11b. 13 can be inserted. In the anchor pile 10 of the first embodiment, a jig (not shown) is screwed to the inner peripheral surface near the upper end of the operation shaft insertion opening 11b when pulling out the pile body 11 from the ground. A jig threaded portion 11d is provided. How to use this jig threaded portion 11d will be described later. A pair of projecting body openings 11c are provided on the surface facing the opposite side of the outer surface of the lower side (the portion buried in the ground) of the pile body 11 . The projecting body opening 11c is a portion for causing a movable projecting body 12, which will be described later, to project outward from the outer surface of the pile body 11. As shown in FIG.

The shape of the pile main body 11 is usually columnar, cylindrical, bar-like, or the like. In the anchor pile 10 of the first embodiment, as shown in FIG. 1, the pile main body 11 is formed in a substantially quadrangular prism shape, and the lower end thereof is formed into a conical shape and sharpened. Thus, by forming the lower end portion of the pile body 11 sharply, the pile body 11 can be easily driven into the ground. The anchor pile 10 of the first embodiment can be driven into the ground (embedded) by striking the upper end with a hammer or the like while the lower end is upright on the construction surface (ground). It's becoming Although the material of the pile body 11 is not particularly limited, it is usually made of metal such as stainless steel, impact-resistant plastic, or the like.

1.2 Movable Protruding Body The movable protruding body 12 is a member for giving pull-out resistance to the pile main body 11 after being buried in the ground. The movable protruding body 12 has a position where it protrudes outward from the outer surface of the pile body 11 (protruding position) as shown in FIG. It is attached to the pile body 11 so as to be rotatable between a position (stored position) where it does not protrude outward from the outer surface. When the movable projecting body 12 is in the retracted position (FIG. 5), the anchor pile 10 can be pulled out relatively easily from the ground (the pull-out resistance is small), but the movable projecting body 12 is in the projecting position (FIG. 5). In the case of 6), the anchor pile 10 cannot be easily pulled out from the ground (pull-out resistance is large).

In this specification, the rotation when moving the movable projecting body 12 from the retracted position (FIG. 5) toward the projecting position (FIG. 6) is referred to as "upright rotation", and moving the movable projecting body 12 to the projecting position (FIG. 6). ) toward the retracted position (FIG. 5) is called a “falling down rotation”. When the movable projecting body 12 in the retracted position (FIG. 5) is turned upright, the movable projecting body 12 protrudes outward from the projecting body opening 11c of the pile body 11 as shown in FIG. When the movable projecting body 12 at the projecting position (FIG. 6) is turned to fall down, the movable projecting body 12 enters inward from the projecting body opening 11c of the pile main body 11 as shown in FIG. is designed to be

As already described, in the anchor pile 10 of the first embodiment, a pair of projecting body openings 11c for projecting the movable projecting bodies 12 are provided on the opposite side of the pile body 11, as shown in FIG. 5, a pair of movable protrusions 12 are also provided. As shown in FIG. 3, each movable projecting body 12 is provided with a shaft support hole 12a on its base end side. For this reason, the movable protruding body 12 can rotate about the rotation center line L ( FIG. or fallen down) (see arrow _A1 in FIGS. 4 and 5). When no rotational force around the rotation center line L is applied, the tip of the movable protrusion 12 hangs downward due to the weight of the tip.

The outer peripheral surface of the base end side of the movable projecting body 12 (the end portion side where the shaft support hole 12a is formed) is formed in a substantially cylindrical shape, and the outer peripheral surface has a large number of teeth α formed in a gear shape. It is formed (formed like the teeth of an external gear). This tooth portion α is a portion for meshing with a tooth portion β (FIG. 2) of the operation shaft body 13, which will be described later. The movable protruding body 12 is provided with a rotational force (rotational force for standing-up rotation or falling-down rotation) about the rotation center line L by engaging the tooth portion β of the operation shaft 13 with the tooth portion α. It has become.

The shape of the movable protrusion 12 is not particularly limited. However, if the thickness of the movable projecting body 12 (thickness in the direction parallel to the rotation center line L; the same shall apply hereinafter) is too small, the anchor pile 10 will not move even if the movable projecting body 12 is rotated upright to the projecting position. There is a possibility that the pull-out resistance of the will not be so large. On the other hand, if the thickness of the movable projecting body 12 is too large, the movable projecting body 12 receives a resistance force from the soil present around the pile body 11 when it is about to project from the projecting body opening 11c by standing and rotating. becomes large, and there is a possibility that the movable projecting body 12 may become difficult to stand up and rotate. For this reason, it is preferable to form the movable projecting body 12 in the shape of a thick plate (conversely, in the shape of a thin block). In the anchor pile 10 of the first embodiment, the movable protruding body 12 is formed in a substantially triangular thick plate shape. The thickness of the movable protrusion 12 is preferably 1-30 mm, more preferably 2-20 mm, and even more preferably 3-15 mm. The shape of the movable protruding body 12 is not particularly limited as long as it has the necessary strength, but it is usually made of metal such as stainless steel.

1.3 Operation shaft As shown in FIG. 4, the operation shaft 13 is inserted into the operation shaft guide part 11c from the operation shaft insertion opening 11b provided in the upper part of the pile main body 11, and is inserted into the operation shaft guide part 11c. By lowering the inside of 11c, it is for giving the said movable protrusion 12 the rotational force of the rotation center line L (FIG. 3) circumference. As shown in FIG. 2, the operating shaft 13 is a shaft-like member, and has a large number of teeth β near its lower end. This tooth portion β is a portion for meshing with the tooth portion α (FIG. 3) of the movable protrusion 12 described above. As shown in FIG. 5, when the operating shaft 13 is lowered while the tooth β is engaged with the tooth α, the tooth β feeds the tooth α to one side, and the movable protruding body 12 is moved to the position shown in FIG. It is designed to rotate upright in the direction of arrow _A1 . Conversely, when the operating shaft 13 is lifted while the tooth β is engaged with the tooth α, the tooth β feeds the tooth α to the other side, and the movable projecting body 12 moves along the arrow A ₁ in FIG. is designed to fall and rotate in the opposite direction.

The tooth portion β may be formed by arranging a large number of tooth portions in a straight line like a tooth portion on the rack side in a so-called rack-and-pinion mechanism. However, in this case, the force that pushes down the operating shaft 13 becomes the force that rotates the movable protruding body 12. Therefore, if the soil around the anchor pile 10 is hard, the operating shaft 13 can be moved with a strong force. Unless the upper end of the operating shaft body 13 is struck with a hammer or the like, the operating shaft body 13 becomes difficult to descend. However, if a force is applied to the movable protruding body 12 by a hammer or the like, the teeth .alpha. There is a risk that it will not move.

For this reason, in the anchor pile 10 of the first embodiment, the tooth portion β of the operation shaft 13 is formed in a thread shape (a convex portion provided so as to spirally wind the outer peripheral surface of the operation shaft 13 formed by As a result, when the operating shaft 13 is rotated (twisted) around its center line while the tooth β is in mesh with the tooth α, the tooth α is sent to one side by the tooth β and the operation shaft 13 is rotated (twisted). The shaft 13 comes to descend. That is, the force that twists the operation shaft 13 causes the movable projecting body 12 to rotate. Therefore, the movable projecting body 12 can be rotated upright without imposing a force on the operating shaft body 13 . Moreover, if a tool such as a hexagonal wrench is used, the operation shaft 13 can be easily twisted with a large torque. In the anchor pile 10 of the first embodiment, as shown in FIG. 2, an enlarged diameter portion 13a is provided at the upper end portion of the operation shaft 13, and a hexagonal wrench is connected to the upper end surface of the enlarged diameter portion 13a. A hexagonal hole 13b is provided for this purpose.

1.4 Construction Method Next, a construction method for the anchor pile 10 of the first embodiment will be described. The anchor pile 10 of the first embodiment is constructed through the following construction procedures 1 to 4.

[Construction procedure 1: Drive-in process of the pile body]
The lower end of the pile body 11 is thrust into the ground, and the upper end surface of the pile body 11 is hit with a hammer or the like to drive the lower side of the pile body 11 into the ground. This driving operation is performed with all the movable projections 12 in the retracted position. The driving of the pile main body 11 is performed until all the projecting body openings 11c become underground.
[Installation procedure 2: Operation shaft inserting process]
Subsequently, as shown in FIG. 4, the operation shaft 13 is inserted into the operation shaft guide portion 11a through the operation shaft insertion opening 11b of the pile body 11, and lowered in the operation shaft guide portion 11a. As shown in FIG. 5, the operating shaft 13 is lowered until the teeth .beta.
[Construction Procedure 3: Twisting Process of Operating Shaft]
Subsequently, the operation shaft 13 is rotated (twisted) around its center line. As already mentioned, in the anchor pile 10 of the first embodiment, the hexagonal hole 13b is provided in the upper end portion of the operating shaft 13, and the work of twisting the operating shaft 13 is performed by this hexagonal hole 13b. This is done by connecting a hex wrench and rotating this hex wrench to one side. Then, the helical tooth part β feeds the tooth part α to one side, and as shown in FIG. It will be in a protruded state. The lower end surface of the enlarged diameter portion 13a of the operating shaft 13 bumps against the counterbore surface of the operating shaft insertion opening 11b, or the upper surface of the movable protrusion 12 bumps against the upper edge of the protrusion opening 11c. When the movable projecting body 12 becomes unable to stand up and rotate any more (a state in which the operating shaft 13 cannot be twisted), the twisting operation of the operating shaft 13 is stopped.
[Construction procedure 4: After completion of construction]
After completing the construction procedure 3, the construction of the anchor pile 10 is completed. When the construction of the anchor pile 10 is completed, the above-mentioned structure fixing portion (not shown) in the upper part of the anchor pile 10 is attached to an above-ground structure such as a fence or a pillar, or the above-ground structure connected to these above-ground structures. Connects supports such as wires and support frames that support objects. These ground structures and supports may be pre-connected to the pile body 11 in step 1 above. The movable protruding body 12 of the anchor pile 10 after construction is in a state of spreading outward in the ground. Therefore, even if an attempt is made to pull out the anchor pile 10 from the ground, the pull-out resistance is increased by the movable protruding body 12, so that it cannot be pulled out easily. Therefore, it is possible to firmly fix the ground structure to the ground with the anchor piles 10 . Moreover, when the anchor pile 10 is used as a land boundary pile, it is possible to prevent the anchor pile 10 from being easily pulled out from the ground or the like.

1.5 Removal Method The anchor piles 10 constructed in the above construction procedures 1 to 4 must be pulled out from the ground when removing the ground structure to which they are fixed. However, in the anchor pile 10 of the first embodiment, as described in "Construction procedure 4: After completion of construction" in the above "4. Construction procedure", the movable projecting body 12 is spread outward in the ground, it cannot be easily pulled out from the ground. In this regard, the anchor pile 10 of the first embodiment can be easily pulled out from the ground by performing the following removal procedures 1-3.

[Removal Procedure 1: Pulling Out Operation Shaft]
In the anchor pile 10 after construction is completed, the operation shaft 13 is held inside the pile main body 11 as shown in FIG. remains in mesh with the teeth α of the movable projecting body 12 . When removing the anchor pile 10 after completion of construction, first, the operation shaft 13 is pulled out from the pile main body 11 . As already described, in the anchor pile 10 of the first embodiment, the hexagonal hole 13b is provided in the upper end portion of the operation shaft 13, and a hexagonal wrench is connected to the hexagonal hole 13b, and this hexagonal wrench is used as described above. When rotating in the opposite direction to the construction procedure 3, the helical tooth portion β sends the tooth portion α to the other side, and the movable projecting body 12 falls and rotates, and as shown in FIG. The pile main body 11 is stored in the portion 11c. When the operating shaft 13 continues to rotate in the pull-out direction, the tooth portion β eventually comes off from the tooth portion α, and the operating shaft 13 becomes free from the pile body 11 . The free operating shaft 13 can be easily pulled out from the pile main body 11 by pulling it up by hand or the like.
[Removal procedure 2: Pulling out the pile body]
Subsequently, the operation of pulling out the pile main body 11 from the ground is performed. The movable protruding body 12 is rotated to the retracted position by the removal procedure 1 described above, and is in a state where it does not protrude outward from the pile body 11 . Therefore, the pull-out resistance of the pile body 11 is small, and the pile body 11 can be pulled out relatively easily. However, it may be difficult to pull out the pile body 11 only by pulling up the pile body 11 by hand or the like. In such a case, a jig (not shown) for pulling out the pile body 11 is screwed into the jig threaded portion 11d (FIG. 4) provided in the operation shaft body insertion opening 11b of the pile body 11. By connecting to the pile body 11 and pulling up the jig by a machine or the like, the pile body 11 can be pulled out from the ground.
[Construction procedure 3: After completion of removal]
When the removal procedure 2 is completed, the hole in the ground from which the pile body 11 was pulled out is backfilled, and all the procedures are completed.

1.6 Summary As described above, the anchor pile 10 of the first embodiment is easy to construct and remove, but when the movable projecting body 12 is set to the projecting position, the pull-out resistance from the ground is large. In addition, the desired pull-out resistance can be exhibited irrespective of the condition of the soil at the place where it is constructed.

2. Anchor Pile of Second Embodiment Next, the anchor pile of the second embodiment will be described. FIG. 7 is a perspective view showing the entire anchor pile 10 of the second embodiment. FIG. 8 is a perspective view showing the operating shaft 13 in the anchor pile 10 of the second embodiment. Regarding the anchor pile 10 of the second embodiment, mainly the different parts from the anchor pile 10 of the first embodiment will be explained, and the explanation of the parts common to the anchor pile 10 of the first embodiment will be omitted. For the configuration not specifically mentioned in the anchor pile 10 of the second embodiment, the same configuration as that of the anchor pile 10 of the first embodiment can be adopted.

In the anchor pile 10 of the first embodiment, as shown in FIGS. 1 and 6, a pair of movable projecting bodies 12 are provided from a pair of projecting body openings 11c provided at the same height of the pile body 11 in opposite directions. It protruded in the opposite direction. On the other hand, in the anchor pile 10 of the second embodiment, as shown in FIG. 7, the projection openings 11c are arranged in multiple stages (two stages in the example of FIG. 7) at different heights on the outer surface of the pile body 11. , and the movable projecting body 12 projects in the opposite direction from the projecting body opening 11c provided in the opposite direction in each stage. In addition, the movable projecting body 12 projecting from the projecting body opening 11c of one stage (the lower stage in the example of FIG. 7) and a stage (see FIG. 7) different from the projecting body opening 11c of the one stage 7, the movable projecting body 12 projecting from the projecting body opening 11c of the upper stage) projects in the orthogonal direction. As a result, it is possible not only to further increase the pull-out resistance of the anchor pile 10, but also to stabilize the anchor pile 10 in the ground with good balance.

A structure like the anchor pile 10 of the second embodiment can be realized, for example, by forming the operation shaft 13 inserted into the pile main body 11 into a form as shown in FIG. The operation shaft 13 in FIG. 8 has a plurality of stages of teeth β (two stages of teeth β ₁ and β ₂ in the example of FIG. 8) on the lower shaft-like portion. The teeth _β1 on the lower side mesh with the teeth α (not shown; see FIG. 3) of the movable projecting body 12 on the lower stage to raise and rotate or fall down the movable projecting body 12 on the lower stage. The teeth _β2 on the upper side mesh with the teeth α (not shown; see FIG. 3) of the movable protrusion 12 on the upper stage to rotate the movable protrusion 12 on the upper stage. is rotated to stand up or down.

Both the lower tooth portion β ₁ and the upper tooth portion β ₂ are formed in a thread shape (the outer peripheral surface of the operation shaft 13 is ), the outer diameter of the portion of the operation shaft 13 where the upper tooth portion _β2 is provided is equal to the outer diameter of the lower side of the operation shaft 13 is larger than the outer diameter of the portion where the teeth _β1 are provided. As a result, when the operating shaft 13 is lowered inside the pile body 11, the lower tooth portion _β1 acts only on the lower movable protrusion 12, and the upper tooth portion _β2 acts on the upper movable protrusion. 12 only.

The number of steps in which the projecting body openings 11c and the movable projecting bodies 12 are provided may be three or more. Even in such a case, it is preferable that the projecting body openings 11c and the movable projecting bodies 12 at different stages are provided in different directions. However, even if the projecting body openings 11c and the movable projecting bodies 12 are provided in too many stages, the mechanism of the anchor pile 10 becomes complicated, and not only does it not contribute much to an increase in the pull-out resistance of the anchor pile 10, Depending on the case, there is also a possibility that the pull-out resistance of the anchor pile 10 may decrease. Therefore, the number of stages in which the projecting body openings 11c and the movable projecting bodies 12 are provided is usually six or less. The number of stages in which the projecting body openings 11c and the movable projecting bodies 12 are provided is preferably five or less, more preferably four or less.

2. Anchor Pile of Second Embodiment Next, the anchor pile of the third embodiment will be described. FIG. 9 is a perspective view showing the movable protrusion 12 in the anchor pile 10 of the third embodiment. FIG. 10 is a side view of the movable projecting body 12 of the anchor pile 10 of the third embodiment. FIG. 11 is a top view of the pair of movable protrusions 12 in the anchor pile 10 of the third embodiment, showing a state in which the movable protrusions 12 are in the protruding position. Regarding the anchor pile 10 of the third embodiment, mainly different parts from the anchor pile 10 of the first embodiment and the second embodiment will be described, and common to the anchor pile 10 of the first embodiment and the second embodiment. The description of the part is omitted. For configurations not particularly mentioned in the anchor pile 10 of the third embodiment, configurations similar to those of the anchor piles 10 of the first embodiment and the second embodiment can be adopted.

In the anchor pile 10 of the first embodiment, as shown in FIG. 3, each tooth portion α in the movable protruding body 12 is formed linearly, while as shown in FIG. was formed in an arc shape. Therefore, as shown in FIG. 5, when the operation shaft 13 is inserted into the operation shaft guide portion 11a of the pile main body 11 and the tooth portion α of the movable projection 12 meshes with the tooth portion β of the operation shaft 13, , the tooth portions α and the tooth portions β are locally brought into contact with each other in a substantially point-like narrow range.

Therefore, in the anchor pile 10 of the first embodiment, when the soil into which the anchor pile 10 is driven is hard and it is necessary to apply a large operating force to the operation shaft 13 when moving the movable projecting body 12 from the retracted position to the projecting position. Alternatively, when the soil into which the anchor pile 10 is driven is hard and it is necessary to apply a large operating force to the operating shaft 13 when moving the movable projecting body 12 from the projecting position to the retracted position, the tooth portions α and the tooth portions β are used. A large local force is applied to the contact portion, and there is a risk that the tooth portion α and the tooth portion β may be damaged. In particular, when moving the movable protruding body 12 from the projecting position to the retracted position in order to pull out the anchor pile 10 after driving the anchor pile 10 once into the ground, the tooth portions α and the tooth portions β may be damaged. Also, there is a possibility that the anchor pile 10 cannot be pulled out even if it is attempted to be pulled out. In this case, very troublesome work such as excavating the area around the anchor pile 10 using a heavy machine or the like is required.

On the other hand, in the anchor pile 10 of the second embodiment, as shown in FIGS. 9 and 10, each tooth portion α of the movable projecting body 12 is formed in an arc shape. In other words, a groove with a semicircular cross section is formed along the curve of the upper surface of the semi-cylindrical upper surface of the movable projecting body 12 on the base end side, and the tooth portion α is formed on the inner wall surface of the groove. are doing. Therefore, when the pair of movable protrusions 12 are arranged side by side as shown in FIG. A circular hole γ is formed at the boundary of the proximal end. When the operating shaft 13 shown in FIGS. 3 and 8 is inserted into the circular hole γ, the teeth α of the movable projecting body 12 mesh with the teeth β of the operating shaft 13 in a wide arcuate range. It's becoming

In the anchor pile 10 of the second embodiment, by adopting the above configuration, the force applied to the contact portion between the tooth portion α and the tooth portion β is dispersed, and damage or the like occurs in the tooth portion α and the tooth portion β. It is possible to prevent it from happening. In other words, the movable protrusion 12 can be reliably rotated about the rotation center line L by rotating the operation shaft 13 . Therefore, it is possible to easily pull out the anchor pile 10 driven into the ground, which was difficult with the anchor pile 10 of the first embodiment.

3. Uses The anchor pile 10 of the present invention is not limited to its use, and can be used for various uses including piles that indicate boundaries of land (boundary piles), piles that fix aboveground structures to the ground, and the like. . Ground structures that can be fixed with the anchor piles 10 of the present invention include fence-shaped ground structures such as intrusion prevention fences, column-shaped ground structures such as telegraph poles and signs, and benches and tables installed in parks and the like. and the like are exemplified.

REFERENCE SIGNS LIST 10 anchor pile 11 pile main body 11a operation shaft guide portion 11b operation shaft insertion port 11c projection opening 11d jig screwing portion 12 movable projection 12a shaft support hole 13 operation shaft 13a enlarged diameter portion 13b hexagonal hole L Rotation center line of movable protruding body α Tooth part α ₁ tooth part α ₂ tooth part β Tooth part γ Circular hole

Claims (6)

a pile body whose lower side is buried in the ground;
a movable projecting body capable of projecting outward from the pile body through a projecting body opening provided on the lower outer surface of the pile body;
and an operation shaft inserted into the pile body from the operation shaft insertion opening provided on the top of the pile body,
The base end side of the movable projecting body is pivotally supported by the pile body, and a plurality of teeth α are formed in a gear shape on the outer peripheral surface of the base end side of the movable projecting body, and a plurality of teeth are formed on the outer peripheral surface of the operating shaft. β is formed,
When the operating shaft is not inserted into the operating shaft insertion opening, the movable projecting body 12 hangs down due to its own weight and enters the retracted position inwardly from the projecting body opening.
When the operating shaft is inserted into the pile main body through the operating shaft insertion opening and lowered, the teeth α and β engage to convert the downward movement of the operating shaft into the rotational movement of the movable protrusion. , the movable projecting body rises and rotates to a projecting position where it projects outward from the opening for the projecting body,
When the operating shaft is lifted, the movable protruding body falls and rotates to the retracted position,
An anchor pile characterized in that the movable protruding body maintains a retracted position even after the operating shaft is pulled out from the operating shaft insertion port .
2. The anchor pile according to claim 1, wherein at least one of the teeth [alpha] or the teeth [beta] is formed in a thread shape.
a pair of projection openings provided on opposite sides of the outer surface of the pile body;
3. The anchor pile according to claim 1 or 2, wherein the pair of movable protrusions protrude in opposite directions from the pair of protrusion openings.
The projecting body openings are provided in multiple stages at different heights on the outer surface of the pile body,
A movable projecting body projecting from a projecting body opening of one stage and a movable projecting body projecting from a projecting body opening of a stage different from the projecting body opening of the one stage are in non-parallel directions. 4. The anchor pile according to any one of claims 1 to 3, which protrudes into the
Any one of claims 1 to 4, wherein a jig screwing portion for screwing a pulling jig when pulling out the pile body from the ground is formed on the inner peripheral surface near the upper end of the operation shaft insertion port. Anchor stakes as described.
An anchor pile construction method for burying the anchor pile according to any one of claims 1 to 5 in the ground.

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